Journal
ACS APPLIED BIO MATERIALS
Volume 2, Issue 4, Pages 1732-1739Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsabm.9b00115
Keywords
temperature sensing; fluorescence intensity ratio; nonthermally coupled levels
Funding
- National Natural Science Foundation of China [11874182]
- Science and Technology Project of the 13th Five-Year Plan of Jilin Provincial Department of Education [JJKH20190179KJ]
- Special funds for provincial industrial innovation in Jilin Province [2018C043-4]
- Jilin University Ph.D. Interdisciplinary Research Funding Project [10183201814]
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Fluorescence intensity ratio (FIR) of rare earth ions has been widely used in real-time and accurate temperature sensing because of its superiority of rapid response, self-reference, and noncontact in recent years. However, the energy gap (Delta E) restriction of thermally coupled levels (TCLs) has hindered the sensitivity and practical use of such detectors. Herein, we investigate the FIR thermometry based on nonthermally coupled levels (NTCLs) of rare earth ions for fabricating a sensitive, precise temperature detector. Compared with the traditional FIR thermometry based on TCLs (TCL-FIR), the designed NTCL-FIR sensing thermometry exhibits a series of excellent performance including extremely low temperature uncertainty (similar to 0.27 K), an ultrahigh temperature sensitivity (>10% K-1), and satisfactory signal recognition ability. The rise of sensitivity and recognition is attributed to breaking the Delta E restriction of TCLs by using an Arrhenius equation. The proposed ideas and methods of NTCL-FIR sensing thermometry can not only improve the performance of temperature sensing devices but also more importantly contribute to the practical development of rare earth ions.
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